JFFS was merged into the Linux kernel prior to the 2.4.0 release. The
current JFFS2 code is also, at the time of writing, in Alan Cox's
2.4-ac kernels. The latest code for the 2.4 version of each, and for
the 2.2 version of JFFS v1, is available from the Linux-MTD CVS
repository. Instructions for accessing this, along with links to
snapshot tarballs for the firewall-challenged, are available from:

http://www.linux-mtd.infradead.org/

The original web site for JFFS and the current code for the 2.0
kernels, along with a link to the jffs-dev mailing list which is
used for discussion of both JFFS and JFFS2, is at:

http://developer.axis.com/software/jffs/

At the time of writing, a web site specific to JFFS2 is intended to
appear ``shortly'' at: